# Emil Pfeffer
**Wikidata**: [Q12346965](https://www.wikidata.org/wiki/Q12346965)  
**Source**: https://4ort.xyz/entity/emil-pfeffer


## References

1. [Encyclopedia of Esperanto](https://dlibra.kul.pl/dlibra/publication/51762/edition/45138/content)
2. IdRef
3. Czech National Authority Database
4. Virtual International Authority File
5. Esperanto en perspektivo
6. Integrated Authority File